Design and Implementation of Precision Phase Measurement Module Base on Digital Dual Mixer Time Difference

Precise phase difference measurement is critical for distributed time synchronization systems. Aiming at the problem of how to realize sub-nanosecond signal, digital dual mixer (DDMTD) technology used measure fine transmission delay and two clock difference. Given that it difficult generate a common source with frequency changes inside FPGA chip, Si5338 chip 4 differential clocks, communication completed through I2C protocol, signal converted into single-ended as The standard signals same different phases, amplification range, making accuracy reach level.